Poly(propylene carbonate): Insight into the Microstructure and Enantioselective Ring-Opening Mechanism

2012 ◽  
Vol 45 (21) ◽  
pp. 8604-8613 ◽  
Author(s):  
Khalifah A. Salmeia ◽  
Sergei Vagin ◽  
Carly E. Anderson ◽  
Bernhard Rieger
Keyword(s):  
Propylene Carbonate ◽  
Ring Opening ◽  
Poly Propylene ◽  
Insight Into

scholarly journals Polypropylene grafted with maleic anhydride and styrene as a compatibilizer for biodegradable poly(propylene carbonate)/polypropylene

2019 ◽  
Vol 14 ◽  
pp. 155892501984971
Author(s):  
Zheng Tian ◽  
Lisha Pan ◽  
Qing Pan
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Maleic Anhydride ◽  
Fourier Transform Infrared Spectroscopy ◽  
Propylene Carbonate ◽  
Ring Opening ◽  
Fourier Transform Infrared ◽  
Resonance Spectroscopy ◽  
Ring Opening Reactions ◽  
Poly Propylene

Polypropylene grafted with maleic anhydride and styrene [PP- g-(MAH- co-St)] was prepared by melt grafting. Fourier transform-infrared spectroscopy showed that maleic anhydride in the form of cyclic anhydride was successfully grafted onto the main chains of polypropylene. PP- g-(MAH- co-St) acts as a compatibilizer for the poly(propylene carbonate)/polypropylene meltblown nonwoven fabric slices. The effect of different contents and grafting proportions of PP- g-(MAH- co-St) on the structure and performance of the poly(propylene carbonate)/polypropylene slices was investigated. The poly(propylene carbonate)/polypropylene slices had favorable compatibility, tensile properties, thermal stability, and degradability, and their melt flow rates were reduced by the addition of PP- g-(MAH- co-St). Fourier transform-infrared spectroscopy and 1H nuclear magnetic resonance spectroscopy spectra showed that ring-opening reactions occur between the anhydride functional groups of PP- g-(MAH- co-St) and poly(propylene carbonate). Ring-opening reactions, chemical bonds, cocrystallization, increased interface adhesion forces, and reduced interfacial tension may be the mechanisms by which PP- g-(MAH- co-St) acts a compatibilizer for poly(propylene carbonate)/polypropylene slices.

scholarly journals Mechanistic Insight into the Superoxide Induced Ring Opening in Propylene Carbonate Based Electrolytes using in Situ Surface-Enhanced Infrared Spectroscopy

2016 ◽  
Vol 138 (11) ◽  
pp. 3745-3751 ◽  
Author(s):  
J. Padmanabhan Vivek ◽  
Neil Berry ◽  
Georgios Papageorgiou ◽  
Richard J. Nichols ◽  
Laurence J. Hardwick
Keyword(s):  
Infrared Spectroscopy ◽  
Propylene Carbonate ◽  
Ring Opening ◽  
Mechanistic Insight ◽  
Surface Enhanced ◽  
Insight Into

Chiral salenCo(iii) complexes with bulky substituents as catalysts for stereoselective alternating copolymerization of racemic propylene oxide with carbon dioxide and succinic anhydride

2021 ◽  
Vol 12 (12) ◽  
pp. 1776-1786
Author(s):  
Zhou Wang ◽  
Ying Mu
Keyword(s):  
Carbon Dioxide ◽  
Propylene Carbonate ◽  
Propylene Oxide ◽  
Succinic Anhydride ◽  
Poly Propylene ◽  
Alternating Copolymerization

Stereoregular poly(propylene carbonate)s and poly(propylene succinate-block-carbonate)s were synthesized with new chiral salenCo(iii) catalysts carrying bulky substituents.

Preparation and properties of poly(propylene carbonate) and nanosized ZnO composite films for packaging applications

2011 ◽  
Vol 122 (2) ◽  
pp. 1101-1108 ◽  
Author(s):  
Jongchul Seo ◽  
Gwonyoung Jeon ◽  
EUi Sung Jang ◽  
Sher Bahadar Khan ◽  
Haksoo Han
Keyword(s):  
Propylene Carbonate ◽  
Composite Films ◽  
Poly Propylene ◽  
Nanosized Zno

Wool powder: An efficient additive to improve mechanical and thermal properties of poly(propylene carbonate)

2017 ◽  
Vol 153 ◽  
pp. 119-127 ◽  
Author(s):  
Haibo Chang ◽  
Qingshuo Li ◽  
Chaojiang Xu ◽  
Runming Li ◽  
Hongxia Wang ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Propylene Carbonate ◽  
Mechanical And Thermal Properties ◽  
Poly Propylene

Employing the Sirolimus-Eluting Poly (Propylene Carbonate) Mesh for the Prevention of Arteriovenous Graft Stenosis in Rats

2018 ◽  
Vol 24 (3) ◽  
pp. 269-277 ◽  
Author(s):  
Hourong Sun ◽  
Chuan-Zhen Liu ◽  
Chunxiao Liu ◽  
Mengmeng Tang ◽  
Guangqing Cao ◽  
...  
Keyword(s):  
Propylene Carbonate ◽  
Western Blotting ◽  
Matrix Metalloproteinase 2 ◽  
Nuclear Antigen ◽  
Boyden Chamber ◽  
Blank Group ◽  
Area Index ◽  
Graft Stenosis ◽  
Poly Propylene

Poly (propylene carbonate, PPC) is a new member of the aliphatic polyester family. An outstanding feature of PPC is that it produces mainly water and carbon dioxide when degraded in vivo, causing minimal side effects. This unique property together with excellent biocompatibility and biodegradability makes PPC a promising material for drug delivery. In this study, we explored the effect of the sirolimus (an inhibitor of cell growth)-eluting PPC mesh on graft stenosis and its possible mechanisms in a rat arteriovenous grafting model. The PPC mesh was prepared by electrospinning. A jugular vein to abdominal aortic autograft transplantation model was established in rats. The graft was then treated by wrapping with the drug mesh or the drug-free mesh or left untreated. Four weeks posttransplantation, neointima was measured with hematoxylin and eosin staining, matrix metalloproteinase-2 (MMP-2), and MMP-9, and proliferating cell nuclear antigen (PCNA) in the grafts were assayed by Western blotting and immunohistochemistry, respectively. In vitro rat aortic adventitial fibroblast cell (RAAFC) migration was assessed using the Boyden chamber assay, and phospho-mammalian target of rapamycin (mTOR) levels in RAAFCs were determined by Western blotting. Animals with the drug mesh had an intimal area index of 4.87% ± 0.98%, significantly lower than that of the blank group (14.21% ± 2.56%) or the PPC group (15.03% ± 2.35%, both P < .05). The sirolimus mesh markedly suppressed MMP-2 and MMP-9 expression, decreased PCNA-positive cell numbers, inhibited RAAFC migration, and reduced phospho-mTOR levels. Our data suggest that the sirolimus-eluting PPC mesh might be potentially applied for the management of grafting stenosis.

Thermal properties and degradability of poly(propylene carbonate)/poly(β-hydroxybutyrate-co-β-hydroxyvalerate) (PPC/PHBV) blends

2009 ◽  
Vol 94 (4) ◽  
pp. 575-583 ◽  
Author(s):  
Jian Tao ◽  
Cunjiang Song ◽  
Mingfeng Cao ◽  
Dan Hu ◽  
Li Liu ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Propylene Carbonate ◽  
Poly Propylene
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